I am trying to solder a continuous line with a non-lead soldering wire but I ended like this. Now it's not conducting but there is no gaps between anywhere. How can I fix this?
The bare wire (you can use cut-off resistor or diode leads) is the best approach, but there is a technique to making solder blobs connect.
Experiment with cooling the tip on a damp sponge before dragging the solder sideways to join two existing blobs. If you get it too hot it will not join. Lead-free solder may be an advantage in this situation as it behaves more "gummy" than beautiful shiny Sn63Pb37 solder.