Crypto-BEP20-DevToken-Allowances

  /**
  * @notice getOwner just calls Ownables owner function. 
  * returns owner of the token
  * 
   */
  function getOwner() external view returns (address) {
    return owner();
  }
  /**
  * @notice allowance is used view how much allowance an spender has
   */
   function allowance(address owner, address spender) external view returns(uint256){
     return _allowances[owner][spender];
   }
  /**
  * @notice approve will use the senders address and allow the spender to use X amount of tokens on his behalf
  */
   function approve(address spender, uint256 amount) external returns (bool) {
     _approve(msg.sender, spender, amount);
     return true;
   }

   /**
   * @notice _approve is used to add a new Spender to a Owners account
   * 
   * Events
   *   - {Approval}
   * 
   * Requires
   *   - owner and spender cannot be zero address
    */
    function _approve(address owner, address spender, uint256 amount) internal {
      require(owner != address(0), "DevToken: approve cannot be done from zero address");
      require(spender != address(0), "DevToken: approve cannot be to zero address");
      // Set the allowance of the spender address at the Owner mapping over accounts to the amount
      _allowances[owner][spender] = amount;

      emit Approval(owner,spender,amount);
    }
    /**
    * @notice transferFrom is uesd to transfer Tokens from a Accounts allowance
    * Spender address should be the token holder
    *
    * Requires
    *   - The caller must have a allowance = or bigger than the amount spending
     */
    function transferFrom(address spender, address recipient, uint256 amount) external returns(bool){
      // Make sure spender is allowed the amount 
      require(_allowances[spender][msg.sender] >= amount, "DevToken: You cannot spend that much on this account");
      // Transfer first
      _transfer(spender, recipient, amount);
      // Reduce current allowance so a user cannot respend
      _approve(spender, msg.sender, _allowances[spender][msg.sender] - amount);
      return true;
    }
    /**
    * @notice increaseAllowance
    * Adds allowance to a account from the function caller address
    */
    function increaseAllowance(address spender, uint256 amount) public returns (bool) {
      _approve(msg.sender, spender, _allowances[msg.sender][spender]+amount);
      return true;
    }
  /**
  * @notice decreaseAllowance
  * Decrease the allowance on the account inputted from the caller address
   */
    function decreaseAllowance(address spender, uint256 amount) public returns (bool) {
      _approve(msg.sender, spender, _allowances[msg.sender][spender]-amount);
      return true;
    }