diff --git a/src/builtins/get_loop_cmd.c b/src/builtins/get_loop_cmd.c
index 83b4f32..b40c3ce 100644
--- a/src/builtins/get_loop_cmd.c
+++ b/src/builtins/get_loop_cmd.c
@@ -5,36 +5,30 @@
 ** get_loop_cmd
 */
 
+#include <fcntl.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
-#include <signal.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
-#include <fcntl.h>
+#include <unistd.h>
 
-#include "ast.h"
-#include "builtins.h"
 #include "common.h"
-#include "exec.h"
-#include "redirects.h"
-#include "u_str.h"
-#include "u_mem.h"
 #include "loop.h"
-#include "local.h"
+#include "u_mem.h"
+#include "u_str.h"
 
 static
 usr_cmd_t *buffers_realloc(usr_cmd_t *usr)
 {
-    char **new_buffers = u_realloc(usr->cmds, sizeof
+    char **new_buffers = (char **)u_realloc((void *)usr->cmds, sizeof
         *usr->cmds * usr->sz, sizeof
         *usr->cmds * (usr->cap << 1));
 
-    if (new_buffers == NULL)
-        return NULL;
+    if ((void *)new_buffers == NULL)
+        return nullptr;
     usr->cmds = new_buffers;
     usr->cap <<= 1;
     return usr;
@@ -43,7 +37,7 @@ usr_cmd_t *buffers_realloc(usr_cmd_t *usr)
 static
 usr_cmd_t *increase_buffers(usr_cmd_t *usr, size_t *buffer_len)
 {
-    usr->cmds[usr->sz] = NULL;
+    usr->cmds[usr->sz] = nullptr;
     getline(&(usr->cmds[usr->sz]), buffer_len, stdin);
     *buffer_len = u_strlen(usr->cmds[usr->sz]);
     usr->cmds[usr->sz][*buffer_len - 1] = '\0';
@@ -52,27 +46,27 @@ usr_cmd_t *increase_buffers(usr_cmd_t *usr, size_t *buffer_len)
 }
 
 static
-usr_cmd_t *handle_end(usr_cmd_t *us, char prompt[])
+usr_cmd_t *handle_end(usr_cmd_t *us, char const *prompt)
 {
     us->sz--;
-    if (!us->cmds[us->sz] || strcmp("end", us->cmds[us->sz])){
+    if (!us->cmds[us->sz] || strcmp("end", us->cmds[us->sz]) != 0){
             printf("%s: end not found.\n", prompt);
             free_array(us->cmds);
-            us->cmds = NULL;
+            us->cmds = nullptr;
             exit(RETURN_FAILURE);
-            return NULL;
+            return nullptr;
         }
         free(us->cmds[us->sz]);
-        us->cmds[us->sz] = NULL;
+        us->cmds[us->sz] = nullptr;
         return us;
 }
 
 static
-usr_cmd_t *get_first_cmd(usr_cmd_t *usr, char prompt[], size_t *bf_len)
+usr_cmd_t *get_first_cmd(usr_cmd_t *usr, char const *prompt, size_t *bf_len)
 {
     if (isatty(STDIN_FILENO))
         printf("%s? ", prompt);
-    usr->cmds[usr->sz] = NULL;
+    usr->cmds[usr->sz] = nullptr;
     getline(&(usr->cmds[usr->sz]), bf_len, stdin);
     *bf_len = u_strlen(usr->cmds[usr->sz]);
     usr->cmds[usr->sz][*bf_len - 1] = '\0';
@@ -80,23 +74,23 @@ usr_cmd_t *get_first_cmd(usr_cmd_t *usr, char prompt[], size_t *bf_len)
     return usr;
 }
 
-usr_cmd_t *get_usr_loop_cmd(usr_cmd_t *usr_cmd, char prompt[])
+usr_cmd_t *get_usr_loop_cmd(usr_cmd_t *usr_cmd, char const *prompt)
 {
     size_t buffer_len;
 
     if (usr_cmd == NULL)
-        return NULL;
-    usr_cmd->cmds = malloc(sizeof(char *) * usr_cmd->cap);
-    if (usr_cmd->cmds == NULL)
-        return NULL;
+        return nullptr;
+    usr_cmd->cmds = (char **)malloc(sizeof(char *) * usr_cmd->cap);
+    if ((void *)usr_cmd->cmds == NULL)
+        return nullptr;
     usr_cmd = get_first_cmd(usr_cmd, prompt, &buffer_len);
-    while (strcmp("end", usr_cmd->cmds[usr_cmd->sz - 1])){
+    while (strcmp("end", usr_cmd->cmds[usr_cmd->sz - 1]) != 0){
         if (isatty(STDIN_FILENO))
             printf("%s? ", prompt);
         if (usr_cmd->sz >= usr_cmd->cap)
             usr_cmd = buffers_realloc(usr_cmd);
         if (usr_cmd == NULL)
-            return NULL;
+            return nullptr;
         increase_buffers(usr_cmd, &buffer_len);
     }
     usr_cmd = handle_end(usr_cmd, prompt);
diff --git a/src/builtins/loop.c b/src/builtins/loop.c
index 41849b5..e3baa3b 100644
--- a/src/builtins/loop.c
+++ b/src/builtins/loop.c
@@ -4,26 +4,25 @@
 ** File description:
 ** foreach
 */
+
+#include <fcntl.h>
+#include <signal.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
-#include <signal.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
-#include <fcntl.h>
+#include <unistd.h>
 
 #include "ast.h"
 #include "builtins.h"
 #include "common.h"
 #include "exec.h"
-#include "redirects.h"
-#include "u_str.h"
-#include "u_mem.h"
-#include "loop.h"
 #include "local.h"
+#include "loop.h"
+#include "u_str.h"
 
 void exit_child(int sig __attribute__((unused)))
 {
@@ -31,7 +30,7 @@ void exit_child(int sig __attribute__((unused)))
 }
 
 static
-bool checking_for_error(ef_t *ef, char **args)
+bool checking_for_error(char **args)
 {
     if (my_array_len(args) < 3)
         return (WRITE_CONST(STDERR_FILENO, "foreach: Too few arguments.\n"),
@@ -42,7 +41,7 @@ bool checking_for_error(ef_t *ef, char **args)
 }
 
 static
-bool checking_while_error(ef_t *ef, char **args)
+bool checking_while_error(char **args)
 {
     if (my_array_len(args) < 2)
         return (WRITE_CONST(STDERR_FILENO, "while: Too few arguments.\n"),
@@ -69,7 +68,7 @@ int foreach_loop(ef_t *ef, char **args, usr_cmd_t *usr_cmds)
     int status = 0;
     char **save_cmds = arraydup(usr_cmds->cmds);
 
-    if (save_cmds == NULL)
+    if ((void *)save_cmds == NULL)
         exit(84);
     for (int i = 2; args[i]; i++){
         if (!set_local(ef->exec_ctx->local, args[1], args[i]))
@@ -88,7 +87,7 @@ int while_loop(ef_t *ef, usr_cmd_t *usr_cmds)
     int status = 0;
     char **save_cmds = arraydup(usr_cmds->cmds);
 
-    if (save_cmds == NULL)
+    if ((void *)save_cmds == NULL)
         exit(84);
     while (true){
         status = do_a_lap(ef, usr_cmds->cmds);
@@ -100,7 +99,7 @@ int while_loop(ef_t *ef, usr_cmd_t *usr_cmds)
 }
 
 static
-int choose_loop(ef_t *ef, char **args, usr_cmd_t *usr_cmd, char prompt[])
+int choose_loop(ef_t *ef, char **args, usr_cmd_t *usr_cmd, char const *prompt)
 {
     if (strcmp(prompt, "foreach") == 0)
         return foreach_loop(ef, args, usr_cmd);
@@ -108,7 +107,7 @@ int choose_loop(ef_t *ef, char **args, usr_cmd_t *usr_cmd, char prompt[])
 }
 
 static
-void launch_loop(ef_t *ef, char **args, char prompt[])
+void launch_loop(ef_t *ef, char **args, char const *prompt)
 {
     int status = RETURN_FAILURE;
     usr_cmd_t *usr_cmds = malloc(sizeof(usr_cmd_t));
@@ -134,7 +133,7 @@ int builtins_foreach(ef_t *ef, char **args)
     int status = 0;
     pid_t pid;
 
-    if (checking_for_error(ef, args))
+    if (checking_for_error(args))
         return RETURN_FAILURE;
     pid = fork();
     if (pid == 0)
@@ -152,7 +151,7 @@ int builtins_while(ef_t *ef, char **args)
     int status = 0;
     pid_t pid;
 
-    if (checking_while_error(ef, args))
+    if (checking_while_error(args))
         return RETURN_FAILURE;
     pid = fork();
     if (pid == 0)
diff --git a/src/loop.h b/src/loop.h
index b8f8544..84c72f0 100644
--- a/src/loop.h
+++ b/src/loop.h
@@ -16,5 +16,5 @@ typedef struct {
     char **cmds;
 } usr_cmd_t;
 
-usr_cmd_t *get_usr_loop_cmd(usr_cmd_t *usr_cmd, char prompt[]);
+usr_cmd_t *get_usr_loop_cmd(usr_cmd_t *usr_cmd, char const *prompt);
 #endif /* LOOP_H */