PROGRAMMING:C programming experiment 5-5 calculating string array length

Input a string arbitrarily from the keyboard, calculate the actual number of characters by array and print it out, that is, do not use the string processing function strlen() to realize the function of strlen.
###Function interface:
```
unsigned int MyStrlen(const char str[])
```
###Input format:
character string
###Output format:
String length
###Input example:
Here is a set of inputs. For example:
```in
hello world
```
###Output example:
The corresponding output is given here. For example:
```out
eleven
```







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