Force deduction ----- sort odd and even subscripts respectively

/** * Note: The returned array must be malloced, assume caller calls free(). */
int* sortEvenOdd(int* nums, int numsSize, int* returnSize){
    
    *returnSize=numsSize;
    int b;
    for(int a=1;a<numsSize;a=a+2){
    
        for(int c=a+2;c<numsSize;c=c+2){
    
            if(nums[a]<nums[c]){
    
                b=nums[c];
                nums[c]=nums[a];
                nums[a]=b;
            }
        }        
    }
    for(int a=0;a<numsSize;a=a+2){
    
        for(int c=a+2;c<numsSize;c=c+2){
    
            if(nums[a]>nums[c]){
    
                b=nums[c];
                nums[c]=nums[a];
                nums[a]=b;
            }
        }        
    }
    return nums;    
}