feat: add ft_strchr function

Makefile

@@ -24,3 +24,6 @@ fclean: clean
 	rm -f $(LIB)
 
 re: fclean $(LIB)
+
+norm: all
+	@act push --container-architecture linux/amd64

ft_strchr.c

@@ -0,0 +1,15 @@
+#include "libft.h"
+
+char	*ft_strchr(const char *s, int c)
+{
+	size_t	i;
+
+	i = 0;
+	while (i < ft_strlen(s))
+	{
+		if (s[i] == c)
+			return ((char *)s + i);
+		i++;
+	}
+	return (NULL);
+}

libft.h

@@ -104,4 +104,6 @@ int	ft_toupper(int c);
 */
 int	ft_tolower(int c);
 
+char	*ft_strchr(const char *s, int c);
+
 #endif