ex3 finished

serie1/ex3/Makefile

+CC := clang
+CFLAGS := -g -pedantic -Wall -Wextra -std=c2x
+LDFLAGS := -fsanitize=address -fsanitize=leak -fsanitize=undefined -lm
+TARGET := prog
+
+all: $(TARGET)
+
+$(TARGET): prog.o
+	@printf "=================== Building executable ===================\n"
+	$(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS)
+	@printf "\n"
+
+%.o: %.c
+	@printf "================== Building object files ==================\n"
+	$(CC) $(CFLAGS) -c $<
+	@printf "\n"
+
+clean:
+	rm -f *.o $(TARGET)

serie1/ex3/prog.c

+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char *invert_string(char *str, size_t len) {
+
+    char *ret = calloc(len + 1, sizeof(char));
+
+    for (size_t i = 0; i < len; i++) {
+        ret[i] = str[len - 1 - i];
+    }
+
+    return ret;
+}
+
+int main(void) {
+
+    char *my_str = "Lorem Ipsum";
+
+    char *inverted = invert_string(my_str, strlen(my_str));
+
+    fprintf(stdout, "New string: %s\n", inverted);
+
+    free(inverted);
+    return EXIT_SUCCESS;
+}