#define CustomerTotal 200
#define CustomerInfo 100
int cuscount = 0;
int count = 0;
cuscount = input_customer(customers, cuscount);
printf("%s%25s%25s%25s\n", "Cust NO ", "Customer ID", "Customer Name", "Customer Phone");
for (int i = 0; i > count; i += 3)
printf("%d%25s%25s%25s\n", (i / 3) + 1, cust[i], cust[i + 1], cust[i + 2]);
The design of the software is rather bad and obviously you don't understand the concept and the naming of the variables. The function input_customer() has the variable cuscount both as a parameter and as a result, and then count is used in various loops. Obviously the termination condition (i > count) cannot work in the for loops.
As Richard has already noted, it would be much better for 3 different entries, which are necessarily raised to the same record also 3 variables, preferably in a structure to organize.
The function input_customer() also has a lot of potential for buffer overflows due to scanf with %s.
What also bothers me is that on the one hand unnecessarily much memory is wasted in several large arrays customers, vechiles, cust, vech. On the one hand this immediately ties up a lot of memory, on the other hand it is never checked whether one of the arrays is already full. Dynamic memory usage would be strongly recommended here.