Change Substraction to Subtraction.

Only changed the files name last time.

Change-Id: I85a809f9ea349e1bec771c61a18d4b5e9b491fdc

poincare/include/poincare/subtraction.h

@@ -3,10 +3,10 @@
 
 #include <poincare/expression.h>
 
-class Substraction : public Expression {
+class Subtraction : public Expression {
   public:
-    Substraction(Expression * first_operand, Expression * second_operand);
-    ~Substraction();
+    Subtraction(Expression * first_operand, Expression * second_operand);
+    ~Subtraction();
     ExpressionLayout * createLayout(ExpressionLayout * parent) override;
     float approximate(Context& context) override;
   private:

poincare/src/expression_parser.y

@@ -80,7 +80,7 @@ exp:
   INTEGER            { $$ = new Integer($1);     }
   | SYMBOL           { $$ = new Symbol($1);    }
   | exp PLUS exp     { $$ = new Addition($1,$3); }
-  | exp MINUS exp    { $$ = new Substraction($1,$3); }
+  | exp MINUS exp    { $$ = new Subtraction($1,$3); }
   | exp MULTIPLY exp { $$ = new Product($1,$3);  }
   | exp DIVIDE exp   { $$ = new Fraction($1,$3); }
   | exp POW exp      { $$ = new Power($1,$3); }

poincare/src/subtraction.cpp

@@ -1,20 +1,20 @@
 #include <poincare/subtraction.h>
 #include "layout/horizontal_layout.h"
 
-Substraction::Substraction(Expression * first_operand, Expression * second_operand) {
+Subtraction::Subtraction(Expression * first_operand, Expression * second_operand) {
   m_left = first_operand;
   m_right = second_operand;
 }
 
-Substraction::~Substraction() {
+Subtraction::~Subtraction() {
   delete m_left;
   delete m_right;
 }
 
-float Substraction::approximate(Context& context) {
+float Subtraction::approximate(Context& context) {
   return m_left->approximate(context) - m_right->approximate(context);
 }
 
-ExpressionLayout * Substraction::createLayout(ExpressionLayout * parent) {
+ExpressionLayout * Subtraction::createLayout(ExpressionLayout * parent) {
   return new HorizontalLayout(parent, m_left, '-', m_right);
 }