In C language please, thank you!

4.) Consider a string "1234" Write a function that takes a string containing some digits in it. The function converts that string into an integer and returns that integer. For example, if you pass "1234" to the function, the return value should be 1234. Do not write the main function. Hint: Get the length of the string and then read each character, convert that character into digit. To convert char to digit, you can use their ascii values. For example, ascii value of '3' is 51, and ascii value of 'O' is 48. So, 51 - 48 is 3. After converting each character, gradually generate the number. For example, for "1234": 0*10+1=1 1 * 10+2 = 12 12.10+ 3 = 123 123 10+ 4 = 1234