Problem 1 - Process Implement a program that calculates the number summation: 1+2+3+...+99+100. Please use multiple processes (i.e., at least two) to share the workload. For example, in the first process you can calculate 1+2+3+..+49+50, and in the second process you can calculate 51+52+53+..+99+100. Please print out the final result of the number summation. Make your code readable and robust and output standard Linux error messages if an error occurs. For example, if the child process is failed to be created, you can use perror"Process creation failed") to output error messages