Using C programming language solve these problems Problem $1$Prompt user for three numbers. Put them in an array. Make a function $($or find existing ones$)$ to Calculate the sum of the three numbers and a function to Calculate the average, call them and then display resultsProblem $2$Above the main functionMake a struct called Employee with attributes for name, hours worked, and pay rate. Make a procedure #$1/$ This procedure takes the struct $($address$)$ as a parameter. This procedure will Output a greeting to the user and then Prompt user to enter name, number of hours worked and pay rate. and then populates the name, hours worked and pay rate as initializing parameters.Make a procedure #$2/$ This procedure takes the struct $($address$)$ as a parameter. that will calculate their gross pay $($multiply number of hours worked by pay rate$).$ Have it prints out the name, hours worked and pay rate, and the gross pay you just calculatedMake your main function. In your main function you will declare an employee struct, then pass the struct to procedure #$1$ by address and have procedure $1$ populate it$.$ Then, pass the struct to procedure #$2$ by address where procedure #$2$ will calculate gross pay and print the name, hours worked and gross pay.Problem $3$Prompt the user for a username and password. Continue to do so until they enter Magic for the username and Kingdom$1$ for the password. Problem $4$Prompt the user to enter the replacement cost of a building. Calculate $80\%$ of the value and tell them thats what Allstate is willing to cover.Print answer using two decimal places precision