erase() should really now set proper values to 0 after move

src/main.c

@@ -126,7 +126,7 @@ at(const Vec8_t* vec, const int idx)
 //    - Result: a b \0 \0 g h i j (size=8, should be 7)
 
 __attribute__((overloadable)) Vec8_t*
-erase(Vec8_t* vec, const int iter) {
+erase(Vec8_t* vec, const size_t iter) {
         if(vec == nullptr) return nullptr;
         if(vec->arr == nullptr) return nullptr;
         if(iter >= vec->size) return nullptr;
@@ -137,13 +137,14 @@ erase(Vec8_t* vec, const int iter) {
 }
 
 __attribute__((overloadable)) Vec8_t*
-erase(Vec8_t* vec, const int iter_start, const int iter_end) {
+erase(Vec8_t* vec, const size_t iter_start, const size_t iter_end) {
         if(vec == nullptr) return nullptr;
         if(vec->arr == nullptr) return nullptr;
-        if(iter_start < 0 || iter_end > vec->size) return nullptr;
-        int diff = iter_end - iter_start;
+        if(iter_start < 0 || iter_end >= vec->size) return nullptr;
+        if(iter_start >= iter_end) return nullptr;
+        size_t diff = iter_end - iter_start;
         memmove(&vec->arr[iter_start], &vec->arr[iter_end], (vec->size - iter_end) * sizeof(char));
-        for(size_t i = vec->size; i > iter_end; i--) {
+        for(size_t i = vec->size - diff; i < vec->size; i++) {
                 vec->arr[i] = 0;
         }
         vec->size -= diff;