Command not found error in Bash script

So I have written a bashscript.sh file to check if a directory project1_repo is empty after cloning a project.

I have written four different functions to authenticate it but all the time I get command not found error. I have checked multiple times if there is a syntax error but in vain. Could someone please help me out? Thanks.

EDIT: Previously due to a typo project1_install_dir was called colsim1_install_dir but the edited version is correct.

#!/bin/bash

#path to install project1
function project1_install_dir() {
   while true; 
 do
  read -p "Enter FULL folder path where you want to install project1:" fullpath
  echo "you have enterd $fullpath. Please press 'y' to confirm and 'n' to enter again"
  read -p "Continue? (Y/N): " confirm 
  if [[ $confirm =~ ^([yY][eE][sS]|[yY])$ ]]; then
    break
  else
    continue         
  fi
done
 }

#clone project1
function clone_project1_repo() {
  git clone example git .     
    }

# four functions to Check whether cloning is successful
# function 1
function success_of_cloning_of_project1_repo3() {
  if find $fullpath/project1/project1_repo -mindepth 1 | read; then
     echo "dir not empty"
  else
     echo "dir empty"
  fi
}

# function 2
function success_of_cloning_of_project_repo2() {
DIR="$fullpath/project1/project1_repo"
if [ -n "$(ls -A $DIR)" ]; then
  echo "Take action $DIR is not Empty"
else
  echo "$DIR is Empty"
fi
}

# function 3    
function success_of_cloning_of_project_repo1() {
if [ -d $fullpath/project1/project1_repo ]; then
      [ -n "$(ls -A $fullpath/project1/project1_repo)" ] && echo "Not Empty" || echo "Empty"
else
   :
fi
    }

# function 4
function success_of_cloning_of_project_repo() {
while true;
 do
  if [ -n "$(ls -A $fullpath/project1/project1_repo)" ]; then
    echo "cloning of project1_repo is successful"               
    break
  else
    echo "cloning of project1_repo is NOT successful."
    continue      
  fi                
 done
}

#calling the functions
    function main() {
       project1_install_dir
       success_of_cloning_of_project1_repo3 
       success_of_cloning_of_project1_repo2  
       success_of_cloning_of_project1_repo1
       success_of_cloning_of_project1_repo
    }

    main

Terminal output:

jen@ex343:tdk/jen$ source bash_file_test.sh 
Enter FULL folder path where you want to install project1:/tdk/jen

you have enterd /tdk/jen. Please press 'y' to confirm and 'n' to enter again
 Continue? (Y/N): y
 You have chosen yes
-bash: success_of_cloning_of_project1_repo3: command not found
-bash: success_of_cloning_of_project1_repo2: command not found
-bash: success_of_cloning_of_project1_repo1: command not found
-bash: success_of_cloning_of_project1_repo: command not found